He also found that certain animals were in only certain layers and that they were in the same layers all across England.Due to that discovery, Smith was able to recognize the order that the rocks were formed.
While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers.
As he continued his job as a surveyor, he found the same patterns across England.
All plants and animals incorporate carbon into their tissues during their lives for growth and energy.
When an organism dies, it stops incorporating carbon (all forms of carbon, including 14C) into its structure.
Knowing which events came before or after others allows scientists to analyze the relationships between the events.